I don't have access to my parts book (visiting 'downtown' for some high speed internet, vs the snail dialup out at the farm), but at one time I found a touch control service manual reproduction posted on the web, possibly from a link on YT - though I can't seem to locate it at present.
The TC-39 parts book has a pretty good parts breakdown diagram, which if you are doing much if any work on your SA, would be well worth the investment.
I did rebuild the touch control block on my SA, but I don't recall not being able to access the relief valve parts. If I recall it correctly (and I admit I could be wrong), the ball and spring install from the head side, with pump pressure internally ported to the ball side of the assembly. All you should have to do is make sure the port is not obstructed (blow it out with air), the valve (ball) seat is clean and shiny, and the ball has no pits. If in doubt of the spring's condition, replace it.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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